Guildcafe is a social media site aimed at multi-game gamers, but Second Life residents (mostly those who are also gamers) are adapting it for their own network.
Second Life folks are creating "guilds" for their primary affiliation in Second Life. You might find people who play an in-world RPG, or who are active in a particular in-world business listing it as their Second Life guild -- which allows them to do outreach and recruit new people to participate with them in-world.
The site includes a way to create a "gamer resume" listing your games, avatar names, years of participation, guild, server, and so on as relevant. It's attracting a high number of socially oriented gamers, and has actually interesting forums on a lot of topics. There are a lot of quizzes and questions, personal blogs, and other features not found on a pure "silo" gaming site like guildportal. This is really more about community -- the meta-game.
If you try it out, tell them Shava sent you -- I get reputation points if you do! There are lots of fun features here, particularly aimed at those of us who span gaming and virtual worlds, but really kind of fun for anyone.
See you there! Feel free to friend me as "shava"
Yrs,
Shava Nerad/Shava Suntzu in SL